Version: v3 Serial Number: 12994571308386356029289264684 Signature Algorithm: SHA256-RSA Issuer: Country: BE Organization: GlobalSign nv-sa CommonName: GlobalSign RSA OV SSL CA 2018 Validity: Not Before: 2024-09-11 07:16 UTC Not After : 2025-10-13 07:16 UTC Subject: Country: KR Province: Seoul Locality: Gangnam-gu Organization: POSCO INTERNATIONAL CORPORATION CommonName: *.poscointl.com Subject Public Key Info: Public Key Algorithm: RSA Public Key: Exponent: 65537 Public Key Modulus: (2048 bits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uthority Key Identifier: F8:EF:7F:F2:CD:78:67:A8:DE:6F:8F:24:8D:88:F1:87:03:02:B3:EB Subject Key Identifier: D3:46:A1:9F:87:EB:72:69:83:79:8E:88:03:47:41:CF:73:70:91:75 Basic Constraints: CA : false Path Length Constraint: UNLIMITED OCSP Server: http://ocsp.globalsign.com/gsrsaovsslca2018 Issuing Certificate URL: http://secure.globalsign.com/cacert/gsrsaovsslca2018.crt Key Usage: Digital Signature Key Encipherment Extended Key Usage: Server Auth Client Auth DNS Names: *.poscointl.com *.daewoo.com *.posco-daewoo.com *.m365.poscointl.com poscointl.com Certificate Signature Algorithm: SHA256-RSA Certificate Signature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

Version: v3 Serial Number: 12994571308386356029289264684 Signature Algorithm: SHA256-RSA Issuer: Country: BE Organization: GlobalSign nv-sa CommonName: GlobalSign RSA OV SSL CA 2018 Validity: Not Before: 2024-09-11 07:16 UTC Not After : 2025-10-13 07:16 UTC Subject: Country: KR Province: Seoul Locality: Gangnam-gu Organization: POSCO INTERNATIONAL CORPORATION CommonName: *.poscointl.com Subject Public Key Info: Public Key Algorithm: RSA Public Key: Exponent: 65537 Public Key Modulus: (2048 bits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uthority Key Identifier: F8:EF:7F:F2:CD:78:67:A8:DE:6F:8F:24:8D:88:F1:87:03:02:B3:EB Subject Key Identifier: D3:46:A1:9F:87:EB:72:69:83:79:8E:88:03:47:41:CF:73:70:91:75 Basic Constraints: CA : false Path Length Constraint: UNLIMITED OCSP Server: http://ocsp.globalsign.com/gsrsaovsslca2018 Issuing Certificate URL: http://secure.globalsign.com/cacert/gsrsaovsslca2018.crt Key Usage: Digital Signature Key Encipherment Extended Key Usage: Server Auth Client Auth DNS Names: *.poscointl.com *.daewoo.com *.posco-daewoo.com *.m365.poscointl.com poscointl.com Certificate Signature Algorithm: SHA256-RSA Certificate Signature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

Version: v3 Serial Number: 4442294852629917971225300053 Signature Algorithm: SHA256-RSA Issuer: Country: BE Organization: GlobalSign nv-sa CommonName: GlobalSign RSA OV SSL CA 2018 Validity: Not Before: 2023-09-15 06:09 UTC Not After : 2024-10-16 06:09 UTC Subject: Country: KR Province: Seoul Locality: Gangnam-gu Organization: POSCO INTERNATIONAL CORPORATION CommonName: *.poscointl.com Subject Public Key Info: Public Key Algorithm: RSA Public Key: Exponent: 65537 Public Key Modulus: (2048 bits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uthority Key Identifier: F8:EF:7F:F2:CD:78:67:A8:DE:6F:8F:24:8D:88:F1:87:03:02:B3:EB Subject Key Identifier: 72:64:ED:39:C1:AD:52:C8:64:F0:FB:3E:9D:B3:41:40:A6:47:0A:C6 CRL Distribution Points: http://crl.globalsign.com/gsrsaovsslca2018.crl Basic Constraints: CA : false Path Length Constraint: UNLIMITED OCSP Server: http://ocsp.globalsign.com/gsrsaovsslca2018 Issuing Certificate URL: http://secure.globalsign.com/cacert/gsrsaovsslca2018.crt Key Usage: Digital Signature Key Encipherment Extended Key Usage: Server Auth Client Auth DNS Names: *.poscointl.com *.daewoo.com *.posco-daewoo.com poscointl.com Certificate Signature Algorithm: SHA256-RSA Certificate Signature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

Version: v3 Serial Number: 4442294852629917971225300053 Signature Algorithm: SHA256-RSA Issuer: Country: BE Organization: GlobalSign nv-sa CommonName: GlobalSign RSA OV SSL CA 2018 Validity: Not Before: 2023-09-15 06:09 UTC Not After : 2024-10-16 06:09 UTC Subject: Country: KR Province: Seoul Locality: Gangnam-gu Organization: POSCO INTERNATIONAL CORPORATION CommonName: *.poscointl.com Subject Public Key Info: Public Key Algorithm: RSA Public Key: Exponent: 65537 Public Key Modulus: (2048 bits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uthority Key Identifier: F8:EF:7F:F2:CD:78:67:A8:DE:6F:8F:24:8D:88:F1:87:03:02:B3:EB Subject Key Identifier: 72:64:ED:39:C1:AD:52:C8:64:F0:FB:3E:9D:B3:41:40:A6:47:0A:C6 CRL Distribution Points: http://crl.globalsign.com/gsrsaovsslca2018.crl Basic Constraints: CA : false Path Length Constraint: UNLIMITED OCSP Server: http://ocsp.globalsign.com/gsrsaovsslca2018 Issuing Certificate URL: http://secure.globalsign.com/cacert/gsrsaovsslca2018.crt Key Usage: Digital Signature Key Encipherment Extended Key Usage: Server Auth Client Auth DNS Names: *.poscointl.com *.daewoo.com *.posco-daewoo.com poscointl.com Certificate Signature Algorithm: SHA256-RSA Certificate Signature: 88:DB:96:7B:7C:73:38:28:85:39:5E:59:48:E5:49:85: B0:7F:A5:5C:E0:3A:D0:59:E7:F8:68:B4:A7:C9:20:27: A5:D7:27:78:67:B4:61:EC:44:6B:0C:DF:CF:C7:DE:80: A0:B2:F0:A9:F6:4F:3D:C5:F7:17:6E:CD:5C:F9:45:B0: 9F:8B:56:76:5F:34:0C:EF:99:3C:7E:7B:A7:51:68:07: 45:5E:EF:0A:CE:13:98:60:1A:2F:23:82:04:CC:BB:05: 6A:A7:78:E8:36:BA:EC:C2:CF:62:6F:90:DC:BF:DB:E7: 9E:C2:24:13:4F:74:54:7D:B6:1E:61:6E:98:E8:9E:07: 2F:3C:69:D8:A7:0F:36:C0:9D:36:00:C4:A8:53:B4:23: 95:72:2A:B5:22:40:8E:E8:63:B4:FD:47:32:CB:C7:E8: A1:BC:A7:73:46:55:BF:B1:E8:B7:BE:07:D8:A0:84:FA: 46:D1:75:B2:89:B6:D7:14:FC:98:1B:0E:D7:E4:3B:CA: CD:8F:89:6C:1B:DA:C5:BF:8E:FD:DF:AF:01:D6:53:2D: FF:AF:A0:BB:16:66:23:EB:2A:EE:2C:45:56:15:43:26: B8:39:DC:6A:7A:FD:FC:86:10:8B:3D:2C:BC:9A:60:A2: 11:D3:C7:3A:F4:3F:68:B5:C9:E0:CF:9E:E8:8C:48:82