What are the steps to extract public key from certificate?

  To extract public key from certificate - In google chrome, go to the https web page (say https://mail.google.com), click on the lock next to the URL, then click on "certificate information", click on the "Details" tab, and then find "Subject Public Key Info", which for mail.google.com says Subject Public Key Algorithm: "PKCS #1 RSA Encryption" and Subject's Public Key:

Modulus (1024 bits):

AF 39 15 98 68 E4 92 FE 4F 4F F1 BB FF 0D 2E B0

FE 25 AA BD 68 04 67 27 EA 6C 43 4C A7 6D CB C8

8F 7E 81 EE 87 26 25 10 12 54 33 9E AA 3D 9B 8F

8E 92 B3 4B 01 E3 F9 4A 29 C3 0F FD AC B7 D3 4C

97 29 3F 69 55 CF 70 83 04 AF 2E 04 6E 74 D6 0F

17 09 FE 9E 20 24 24 E3 C7 68 9C AC 11 BD 92 E4

B2 1B 09 F2 02 32 BB 55 1B 2D 16 5F 30 12 23 E2

4C 4A 8D C2 DA 3F E1 B8 BF F7 3A B1 86 BE F0 C5

Public Exponent (24 bits):

01 00 01

This corresponds to the decimal numbers N=123045765072979014913511278179231402316770142733119510397469126703890433473616878571037576880489731114142173557070569117331013682110047985574967516701153320350820086344743718518661070276817382223900929884490765709232088941906671668904441902033030813416432622693650320785674286428555963210887699747381872357573

and exponent=65537 used in RSA.